Subject: Re: [harryproa] 90x90
From: "Rob Denney" <>
Date: 1/20/2008, 9:08 PM


Not one of my better efforts, as Sailor2 has pointed out on the discussion forum page. Mk 2 is on the way, looks very similar to Yellow Pages with the ability to shunt.  Pictures and a description on the SA America's  Cup forum in the next couple of days.

The dumbell shape makes sense for a lot of reasons, including the possibility of generating some upward force.  I like the hulls on the end of the tube as, if they articulate, it is impossible to nose dive. Both need big boats to work.  Believe it or not, I am still waiting for the call from Larry or Ernie to try it on their boats.  ;-)



On Jan 20, 2008 2:41 PM, Robert <> wrote:

Saw your design for the 90'x90' contender in Sailing Anarchy. Makes
sense. The only thing I could think of differently was more of a
platform at the intersection of the crossbeam and longitudinal beam.

I have thought of optimising prismatic coefficient by having a
dumbell shape with pointy ends for shorter boats than your 90' but for
shorter lengths it didn't seem to make sense for mid range speeds. A
flexible hull that lifted in the middle at low speeds to minimise
wetted area, flattened out as the load increased to lengthen the hull,
and then flatten the bow ends to start planing as the load increased
further, was needed for it to work.

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